diff --git a/types/index.d.ts b/types/index.d.ts
index 77280f5ae..8c423bc5f 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -554,6 +554,10 @@ export interface StartOptions {
   write?: any;
   source_map_support?: any;
   disable_source_map_support?: any;
+  /**
+   * Shortcut to inject a PORT environment variable.
+   */
+  port?: number;
   /**
    * The environment variables to pass on to the process.
    */